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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | 12. PROPERTY, PLANT AND EQUIPMENT As of September 30, 2025 and September 30, 2024, property, plant and equipment at cost and accumulated depreciation were as follows:
(in thousands) |  | September 30, 2025 |  | September 30, 2024
Land |  | $ | 29,766 |  |  | $ | 29,401 |
Buildings and related improvements |  | 217,894 |  |  | 192,569 |
Machinery and equipment |  | 701,220 |  |  | 596,748 |
Leasehold improvements |  | 22,116 |  |  | 22,814 |
Software |  | 64,371 |  |  | 57,363 |
Construction in progress |  | 107,758 |  |  | 248,128 |
Property, plant and equipment, at cost |  | 1,143,125 |  |  | 1,147,023 |
Accumulated depreciation |  | (548,859) |  |  | (494,930) |
Property, plant and equipment, net |  | $ | 594,266 |  |  | $ | 652,093 |
Depreciation expense for fiscal years ended September 30, 2025, September 30, 2024 and September 30, 2023 was $82,609, $65,507 and $57,720, respectively. During fiscal 2025, the Company recorded two non-cash impairment charges totaling $59,596 related to certain long-lived assets related to its HDPE pipe and conduit products, primarily fixed assets and definite-lived intangible assets. Impairment charges of $2,918 were recorded to buildings and related improvements, $32,463 were recorded to construction in progress, $1,548 was recorded to leasehold improvements and $22,667 was recorded to machinery and equipment. Refer to Note 14 “Fair Value Measurements” for further discussion of the Company’s impairment review. No impairment was recorded during the fiscal year ended September 30, 2024. As a result of the asset impairment charges, the book basis of the HDPE fixed assets was adjusted to the new fair value. This resulted in the elimination of previously accumulated depreciation of $14,965, as well as an equivalent reduction in gross fixed assets.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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